While XTR has always been the group for light race performance at the cost of durability XT has always been the high-end group that will durably do just about everything XTR will do but a little heavier and cheaper. The Deore XT CS-M770 cassette is no exception with long-lasting chrome plated steel cogs precision designed with Hyperglide shift ramps for crisp fast shifting. Another smart advancement is overshift pins on the back of the largest cog preventing the chain from becoming fully em…